Finding the Fourth Proportional to 109,511.89, 164,285.58 and 42,915.91

Step by Step Solution

1. Step 1: Write the proportion equation
   109,511.89 : 164,285.58 = 42,915.91 : x
2. Step 2: Convert to fraction form
   109,511.89/164,285.58 = 42,915.91/x
3. Step 3: Cross multiply
   109,511.89x = 164,285.58 × 42,915.91
4. Step 4: Simplify right side
   109,511.89x = 7,050,465,165.58
5. Step 5: Solve for x
   x = 7,050,465,165.58/109,511.89
6. Step 6: Final answer
   x = 64,380.82